Stoker conveyer



4% g iwi 2 g 3% H. P. ANDERSON STOKER CONVEYER Filed Jan. 3, 1933 Feb. 25, 1936.

INVENTOR. Howard P Anderson ATTORNEY.

Patented Feb. as, m

PATENT OFFICE STOKER CONVEYER Howard Anderson, Erie, Pa., assignor to The Standard Stoker Company, Incorporated, a corporation of Delaware Application January 3, 1933, Serial No. 649,851

4 Claim.

This invention relates generally to stokers and more particularly to the rear portion thereof in cluding a trough, a screw conveyer mounted therein and a crusher mounted in the forward end thereof over the screw conveyer.

In devices of the type described it has been customary to employ a screw conveyer having a fiat impelling face. In such constructions, when conveying fuel containing large lumps, there is a tendency for the large lumps to ride on top of the screw adjacent the crusher instead of being engaged by the crusher and broken down into lumps of a size suitable for firing. An accumulation of suchlarge lumps adjacent the crusher restricts the free fiow of the fuel through the trough causing at times an insufficient delivery of fuel to the locomotive firebox.

It is, therefore, the primary object of this invention to provide a stoker construction which will insure an adequate supply of fuel to the firebox regardless of the size of the fuel in the tender.

More specifically it is an object of the invention to provide in a stoker trough, a screw conveyer of novel construction which will promote engagement of the large lumps of fuel with the crushing mechanism.

With these and other objects in view, which will become apparent as the description proceeds, the invention resides in the construction, combination and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the accompanying drawing, in which Fig. 1 is a longitudinal vertical central section through the forward portion of a locomotive tender with a stoker trough applied thereto and shown in similar section and the novel screw conveyer mounted in the trough and shown in elevation;

Fig. 2 is a sectional view on the line 22 Fig. 1; and

- Fig. 3 is a fragmentary sectional view of the screw flight taken on the line 3-3 of Fig. 1.

0n the drawing, the tender is indicated as a whole by the numeral l0 and comprises a frame II, a fuel bin l2 and the floor l3. The fioor I3 is provided with the central longitudinal opening l4, and slide plates l are arranged to cover or uncover desired portions of the opening i4.

Beneath the opening I4 is mounted an open mouth trough I6, which is provided at its forward end with the tubular extension I! detachably secured to the front wall l8 of the trough i6. An opening 19 in the front wall 3 provides communication between the trough l6 and the tubular extension l'l. Formed with the extension I1 is a spherical flange 20 adapted to be received in a spherical portion of the vertically split coupling member 2| carried by the tubular conveyer section 22. 5

A screw conveyer 23 is disposed in the trough l6 and extends forwardly through the opening IS in the front wall thereof into the tubular extension ll. A crusher member 24 is mounted in the trough l6 from the front wall i3 and arches 10 over the screw conveyer 23. Coal is carried forwardly through the trough l6 by the screw conveyer 23 and the lumps that are too large to pass beneath the crusher member 24 are forced against the latter by the screw 23 and crushed to a suit- 5 able size for firing.

v In order to insure engagement of the coal with the crusher member 24, the screw conveyer 23 is constructed in a novel manner, hereinafter described in detail. The screw conveyer 23 comprises a hub and a helicoid thread 26. Approximately two complete turns of the helicoid thread 26 adjacent the crusher member 24 are formed with a concave impelling face 21 having a peripherical bead or thickened portion 23 on 25 its outer edge. The concave impelling face 21 is provided with another bead or thickened portion'29 intermedate the peripherical bead 23 and the hub 25 and substantially coextensive with the bead 28. thread 26 may be of any desirable construction, that shown in Figure 1 being the preferred form.

It comprises a helicoid thread having a straight impelling face 30, the thread of the screw being cut away so as to leave series of radially extending segments or projections 3| and 32 which are axially spaced from one another by a distance greater than the pitch of the screw. As shown, the series of projections 3! are in alinement with one another, each projection being spaced two turns from an adjacent projection, and the second series of segments or projections 32 are similarly spaced with reference to one another and angularly displaced from the projections of the first series by 180.

In operation, coal is carried forwardly through the trough l6 by the screw conveyer 23 and upon reaching the forward end of the trough the large lumps are caught between the conveyer screw 23 and the crusher member 24 and crushed. However, if a conveyer screw having a flat impelling face is employed there is a tendency for the large lumps of coal to slip from between the crusher member and the conveyer screw instead of being caught therebetween and will ride on The remainder of the helicoid 30 the conveyer screw in front of the crusher member. In my construction, the irregular projections on the large lumps of coal are engaged by the beads or thickened portions 28 and 29, preventing the lumps of coal from slipping and causing them to be crushed against the crusher member 24.

I claim:

i. In a stoking mechanism, the combination of a trough having a fuel receiving opening, a crusher member in said trough at the forward end thereof, a conveyer screw mounted in said trough for advancing fuel therethrough, said conveyer screw adjacent said crusher member having a bead formed on its impelling face extending outwardly from its peripheral edge and a bead formed on its impelling face radially inward of said peripheral bead.

2. In a stoking mechanism, the combination of a trough having a fuel receiving opening, a crusher member in said trough at the forward end thereof, a conveyer screw mounted in said trough for advancing fuel therethrough, said conveyer screw adjacent said. crusher member having a bead formed on its impelling face extending outwardiy from its peripheral edge and a bead formed on its impelling face 'radially inward of and concentric with said peripheral bead.

3. In a stoking' mechanism, the combination of a trough having a fuel receiving opening, a crusher member in said trough at .the forward end thereof, a conveyer screw mounted in said trough for advancing fuel therethrough, said conveyer screw adjacent said crusher'member having a concave impelling face and a bead formed on its impelling face extending outwardly from its peripheral edgeand a bead formed on its impelling face radially inward of said peripheral bead.

4. In a stoking mechanism, the combination of a trough having a fuel receiving opening, a crusher member in said trough at the forward end thereof, a conveyer screw mounted in said trough for advancing fuel therethrough, said conveyer screw adjacent said crusher member having a concave impelling face and a bead formed on its impelling face extending outward- 1y from its peripheral edge and a bead formed on its impelling face radially inward of and concentric with said peripheral bead.

HOWARD P. ANDERBON. '1 

